<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body" v-for="(shopCart,index) in shopCartList" :key="index">
        <ul class="cart-list" v-for="cartInfo in shopCart.cartInfoList" :key="cartInfo.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="cartInfo.isChecked" @click="updateOne(cartInfo)">
          </li>
          <li class="cart-list-con2">
            <img :src="cartInfo.imgUrl">
            <div class="item-msg">{{cartInfo.skuName}}</div>
          </li>
          
          <li class="cart-list-con4">
            <span class="price">{{cartInfo.skuPrice}}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="changeNum(-1,cartInfo)">-</a>
            <input autocomplete="off" type="text" :value="cartInfo.skuNum" minnum="1" class="itxt" @change="changeNum($event.target.value*1-cartInfo.skuNum,cartInfo)">
            <a href="javascript:void(0)" class="plus" @click="changeNum(1,cartInfo)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{cartInfo.skuPrice * cartInfo.skuNum}}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet" @click="deleteOne(cartInfo)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>

      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" v-model="isCheckedAll">
        <span>全选</span>
      </div>
      <div class="option">
        <a href="#none" @click="deleteAll">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{checkedNum}}</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{allMoney}}</i>
        </div>
        <div class="sumbtn">
          <!-- <a class="sum-btn" href="###" target="_blank">结算</a> -->
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {mapState} from 'vuex'
  export default {
    name: 'ShopCart',
    mounted(){
      this.getShopCartList()
    },
    methods:{
      getShopCartList(){
        this.$store.dispatch('getShopCartList')
      },
      async changeNum(disNum,cartInfo){
          // disNum = 变化的量 - 当前的量
          if(disNum + cartInfo.skuNum < 1){
            disNum = 1 - cartInfo.skuNum
          }
          // console.log(disNum);
        try {
          await this.$store.dispatch('addOrUpdateShopCart',{skuId:cartInfo.skuId,skuNum:disNum})
          alert('修改数量成功')
          // 重新获取界面
          this.getShopCartList()
        } catch (error) {
          alert('修改数量失败')
        }
      },
      // 点击更新选中状态值
      async updateOne(cartInfo){
        try {
          await this.$store.dispatch('updateOneIsChecked',{skuId:cartInfo.skuId,isChecked:cartInfo.isChecked?0:1})
          alert('修改单个状态成功')
          this.getShopCartList()
        } catch (error) {
          alert('修改数量失败')
        }
      },
      // 点击删除选中的购物车
      async deleteOne(cartInfo){
        try {
          await this.$store.dispatch('deleteShopCart',cartInfo.skuId)
          alert('删除单个商品成功')
          this.getShopCartList()
        } catch (error) {
          alert('删除单个商品失败')
        }
      },
      // 点击删除所有选中的购物车
      async deleteAll(){
        let skuIds = []
        this.shopCartList.forEach((item)=>{
          item.cartInfoList.forEach((item1)=>{
            if(item1.isChecked){
              skuIds.push(item1.skuId)
            }
          })
        })
        try {
          await this.$store.dispatch('deleteAllShopCart',skuIds)
          alert('删除所有选中成功')
          this.getShopCartList()
        } catch (error) {
          alert('删除所有选中失败')
        }
      }
    },
    computed:{
      ...mapState({
        shopCartList: state => state.shopCart.shopCartList
      }),
      // 计算选中的商品数量
      checkedNum(){
        return this.shopCartList.reduce((prev,item)=>{
          return prev += item.cartInfoList.reduce((prev1,item1)=>{
            if(item1.isChecked){
              return prev1 += item1.skuNum
            }
          },0)
        },0)
      },
      // 计算选中的商品的价格和
      allMoney(){
        return this.shopCartList.reduce((prev,item)=>{
          return prev += item.cartInfoList.reduce((prev1,item1)=>{
            if(item1.isChecked){
              return prev1 += (item1.skuNum * item1.skuPrice)
            }
          },0)
        },0)
      },
      // 计算是否全选
      isCheckedAll:{
        get(){
          // 简写
          // return this.shopCartList.every(item=>item.cartInfoList.every(item1=>item1.isChecked === 1))
          return this.shopCartList.every((item)=>{
           return item.cartInfoList.every((item1)=>{
             return item1.isChecked === 1
            }) 
          })&& this.shopCartList.length > 0
        },
        async set(val){
          // val是修改多选框时,会把多选框最新的checked的属性值传递进来是一个布尔值,需要隐式转换
          let isChecked = val?1:0
          let skuIds = []
          this.shopCartList.forEach((item)=>{
            item.cartInfoList.forEach((item1)=>{
              if(item1.isChecked !== isChecked){
                skuIds.push(item1.skuId)
              }
            })
          })
          try {
            await this.$store.dispatch('updateAllIsChecked',{isChecked,skuIds})
            alert('修改多个选中状态成功')
            this.getShopCartList()
          } catch (error) {
            alert('修改多个选中状态失败')
          }
        }
      }
    }
  }
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>